package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
public class UserServiceImpl implements UserService {
    public static final String WX_LOGIN="https://api.weixin.qq.com/sns/jscode2session";
    @Autowired
    WeChatProperties weChatProperties;
    @Autowired
    UserMapper userMapper;
    @Override
    public User login(UserLoginDTO userLoginDTO) {
        String openid = getOpenid(userLoginDTO.getCode());


        //判断openid是否为空 为空则登录失败 抛出异常
        if(openid==null)
        {
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        //判断是否注册过
        User user=userMapper.selectByOpenid(openid);

        //如果user为空 自动注册
        if (user==null)
        {
            user= User.builder().openid(openid).createTime(LocalDateTime.now()).build();
            userMapper.insert(user);
        }
        //返回用户对象
        return user;
    }

    private String getOpenid(String code) {
        //向微信接口服务发送请求 获取openid
        Map<String,String> map=new HashMap<>();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code", code);
        map.put("grant_type","authorization_code");

        String json= HttpClientUtil.doGet(WX_LOGIN, map);

        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        return openid;
    }
}
